There will come a point in time when there will be no more v4 addresses availble. Won't there?
So, businesses, old and new will not be able to expand if any part of their business, and any business plan, requires new IPv4 addresess on the assumpton that they cannot access v6 addresses.
It seems to me that being prepared for this scenario is common sense.
I remember working on C code bases for the Y2K problem in 1998 onwards.
It had to be done. Or else what have been the consequences for not doing the preparation?
'If it ain't broke don't fixit' is sometimes used as an excuse for the lack of courage to tell some other person that doing something will cost money now.